Henry fischer



(No Model.)

H. FISCHER. STEAM ROCK DRILL.

Patented'MaL 8, 1887.

IN V'EJV TOR WITNESSES:

S m M S w H H N PETERS. Photo-Lithographer. Wndfingicn. D C.

INITED STATES PATENT OFFICE.

HENRY FISCHER, OF NEYV YORK, N. Y.

STEAM ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No 359,143, dated March 8, 1 887.

Application filed July 2-2, 1856.

To all whom it may concern.-

Be it known that I, HENRY Frscnnn, a citizen of the United States, residing at New York, in the county and State of New York. have invented new and useful Improvements in Steam Rock-Drills, of which the following is a specification.

My invention relates to improvements in steam rock-drills; and it consists in certain novel features of construction,which are fully pointed out in the following specification and claims, and illustrated in the accompanying drawings, in which- Figure 1 represents a longitudinal central section of a rock-drill embodying my invention. Fig. 2 is a transverse section thereof in the plane as 00, Fig. 1. Fig. 3 is a longitudinal section in the plane 3 3 Fig. 2. Fig. 4 is a transverse vertical section in the plane z 2, Fig. 1. Fig. 5 is an inverted plan view of the valve-chest of the rock-drill. Fig. 6 is a horizontal section in the plane 5c 00, Fig. 1. Fig. 7 is an elevation of the valve detached.

Similar letters indicate corresponding parts.

. In the drawings, the letter A designates the cylinder of a steam rock-drill.

B is the plunger or piston which works in the cylinder.

C is the valve-chest having a cylindrical bore.

a a are the steam-ports leading from this valve-chest to the respective ends of the cylinder A.

D is the valve fitted in the valve-chest.

E, Figs. 1 and 2, is the admission-port for the entrance of live steam into the chest, and F, Fig. 2, is the exhaust-opening which leads from said valve-chest.

'The valve D, Figs. 1, 2, and 7, consists of two circular heads, d (1*, which closely fit the cylindrical bore of the cylinder, and are connected by an eccentric shank, d, which contains a port, f, that connects with a horizontal channel, f, situated in the center of the valve and extending through its heads d. This channel f is in line with and communicates with the exhaust-opening F of the valve-chest, so that the exhaust-steam entering the valve from the cylinder A can freely make its escape through said valve.

Around the shank of the valve D and be- Serial No. 208,739. (No model.)

tween its heads d d is formed an isolated steam-space which communicates with the exhaust-ports a a of the cylinder, so that when either of said ports a a are uncovered live steam from the boiler can freely enter the cylinder at the proper end. The bottom of the shank d, which is flush with the periphery of the heads is in a steam-tight contact with the wall of the steam-chest, and the port f therein is so located that when one of the ports a a is open the port f in the valve opens on the other port. By imparting to the valve D a reciprocating rocking motion the plunger is moved to reciprocate in its cylinder. To prevent leakage about the valve from wear I make the bore of the valve-chest slightly tapering and turn the valve up correspondingly, so that it can be drawn inward to take up for wear. In this example I automatically impart this motion to the valve by the following means.

' In the walls of the cylinder and to either side of the center line of the ports a a are formed two small auxiliary cylinders, G G, Figs. 2, 3, 5, and 6, which are connected with the cylinder A by steam-channels g g. In these cylinders are spring-pressed pistons g 9 the vertical rods of which are in contact with a diametrical rib or projection, h, Figs. 2, 5, and 7, on the face of the head (1 of the valve D, so that as steam is admitted to one of the auxiliary cylinders G G its piston is raised, and the valve D is turned to open one of the ports, and vice versa. The channels 9 g are opened and closed to admitsteam to the respective auxiliary cylinders by the move ment of the piston, as usual with steanractuated valves.

To regulate the length of the are through which the valve is rotated by the pistons, I use two set-screws, t i, Figs. 2 and 3, that enter the valve-chest from above and are engaged by the rib or projection h on the valve D. By setting these screws in the proper manner the steam may be caused to expand more or less in the cylinder.

To exhaust any steam which may enter the auxiliary steam-cylinders above their pistons, I connect the said cylinders with the exhaustportf by small channels j j, Figs. 3 and 5,extending through the wall of the valve-chest be tween the head of the same and the head (I of ICQ through the casing and carries a handwhcel on its outer end.

To turn the plunger B at the proper intervals I bore out the plunger at m, Figs. 2 and '4, to allow the entrance of a shank, M, having therein a number of helical grooves, m, which are engaged by balls m", contained in the end of the piston, said balls being free to rotate, whereby an almost frictionless contact is obtained. The shank M is held stationary as the piston moves on its upward or nonworking stroke,and consequently the plunger turns. To accomplish this I provide the rear end of the shank M with an enlarged portion or frictionwheel N,Figs.1 andet, which is fitted into the cylinder-head A, and a groove therein is engaged above and below by wedge-shaped keys N N, which are inserted in key ways in said head, and are subjected to the action of springs a, and said keys can be adjusted by means of setscrews a bearing upon the springs. W hen the friction-wheel is strained to turn in a dii rection opposite to arrow 1, Fig. 4, the keys l are drawn inward in the keyways, and are i consequently forced upon the friction-wheel, thereby binding the same. The wheel when strained in the direction of arrow 1, Fig. 4, i

draws the keys outward, whereby they are re leased from said wheel and the latter can rotate freely. \Vhen the shank M is held stationary, the plunger is turned, and vice versa.

A steadying-disk, a, is attached to the shank M, which turns in the end of the cylinder and i affords a larger bearing.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a cylinder and its i ports, of a valve-chest having a cylindrical bore, a valve fitted to said bore, an exhaustport extending through said valve and opening to receive and discharge the exhaust-stea1n from the ports of the cylinder, and auxiliary steam-actuated pistons reciprocated alternately in opposite directions for rocking the valve, substantially as set forth.

2. The combination, with a cylinder and its ports, of a plunger fitted in the cylinder, a valvechest, a valve fitted therein, the auxiliary cylinders G G, opening to the cylinder, the pistons 1 in said cylinders, and the rods on said pistons engaging the valve to rock the same, substantially as set forth.

3. The combination, with a cylinder and its ports, of a'plunger fitted in the cylinder, a val ve-chest, a valve, D, fitted in said chest, the exhaust-ports f f therein, the projection or rib h on the face of the valve, the auxiliary cylinders G G, the channels communicating with the cylinder and the auxiliary cylinders and opened and closed by the motion of the piston, the spring-pressed pistons g y in said cylinders, the rods thereof engaging the rib or projection on the valve, and the set-screws z 2 for regulating the vibrations of the valve, substantially as set forth.

at. In a rock-drill, the combination, with the cylinder, of a recessed plunger, B,fitted therein, the balls m in said plunger, the shank M, having grooves engaged by the balls, the grooved portion or wheel N on said shank, and the keys or wedges engaging said grooved portion, substantially as shown and described.

5. In a rock-drill, the combination,with the cylinder and the recessed plunger therein, of a grooved or threaded shank, M, having a bearing at one end of the cylinder and engaging the plunger with its free end, a grooved wheel or port-ion at the bearing end of the shank, and the springpressed wedges or keys bearing upon the fixed portion of the shank to prevent the rotary motion of the same in one direction, substantially as shown and described.

scribing witnesses.

HENRY FISCHER. [as] Vitnesses:

XV. IIAUFF. A. Fauna nu FA'UR, Jr. 

